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Sep, 1956
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Apr, 1958
Aquatic telephones let skin divers talk under water
Aquatic telephones let skin divers talk under water This swimmie-talkie uses water as a medium for sending high-frequency sound waves, on the principle of the hydrophone employed in the early 1900’s for communicating between ships, and in World War I for detecting submarines. Being adjusted here on a frogman, the Aquavox includes a face-mask mike, […]
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